Spring-tooth cultivator.



G. G. BRIGDEN. SPRING TOOTH GULTIVATOR.

APPLICATION FILED JUNE 5, 1909.

944,770. Patented Dec.28,1909. 2 SHEETS-SHEET 1.

ATTORAIE Y8 ANDREW. E. GRAHAM c0. PHOYO-LITMDGRAPHERS. wAsumMoI. o. c.

G. G. BRIGDEN. SPRING TOOTH GULTIVATOR.

APPLIGATION FILED JUNE 5, 1909.

944,770. Patented Dec.28,1909.

2 SHEETS-SHEET 2.

WITNESSES MENTOR M G'eorye QBrz'g den By W ATTORNEYS mnszw, n4 GRAMM00., Pmrmumwcmwniks. WASKINGTON. B a

'tinrrnn s'ra'rns PATENT clarion.

GEORGE Gr. BBIGDEN, OF CYPRESS, ALABAMA.

SPRING-TOOTH CULTIVATOR;

To all whom it may concern:

Be it known that I, GEORGE G. BRIGDEN, a citizen of the United States,and a resident of Cypress, in the county of Hale and State of Alabama,have invented a new and Improved Spring-Tooth Cultivator, of which thefollowing is a full, clear, and exact de scription.

This invention relates to cultivators, and particularly to that type ofcultivator described in the patent to Arthur Brigden, No. 91%l,788. Acultivator of this type presents cross bars to which the spring teeth orhoes are attached. By adjusting the position of these cross bars, thearrangement of the teeth can be changed as desired.

The object of this invention is to provide an improved construction forthe adjusting mechanism which will insure that the bars will holdthemselves perfectly rigid in their different adjusted positions.

The invention consists in the construction and combination of parts tobe more fully described hereinafter, and particularly set forth in theclaims.

Reference is to be had to the accompany ing drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a plan of a cultivator constructed according to thisinvention, the tongue and portions of the handle being broken away, inthis view in dotted lines I represent the teeth in an adjustedcondition; Fig. 2 is a side elevation of the cultivator shown in Fig. 1;Fig. 3 is av side elevation showing part of the tongue, the same beingindicated partly in cross section, and illustrating particularly themeans for clamping the adjusting links which hold the cross bars rigid;Fig. 4; is a perspective of oneof the links referred to above.

Referring more particularly to the parts, and especially to Figs. 1 and2, 1 represents the tongue or pole of the implement, to the rear end ofwhich the handles 2 are attached, as shown. Near its rear end the poleis provided with laterally projecting cross bars 3 which are connectedto the pole by a common pivot bolt 4. Behind these cross bars 3, rearcross bars 5, 5, are attached by a common pivot bolt 6, and these crossbars are parallel with the forward ones and connected therewith by links7, as shown. To the cross bars 3 and 5, rearwardly extendingSpecification of Letters Patent.

Application filed June 5, 1909.

Patented Dec. 28, 1909.

Serial No. 500,311.

teeth or hoes 8 are pivotally attached at 9. These teeth are disposedequidistant from each other and the rear ends thereof are formed intocurved bows or springs 10, the ends of which are sharpened and till theearth, as will be readily understood.

At an intermediate point on each of the rear cross bars 5, an adjustinglink 11 is attached by a pivot bolt 12. These links 11 extend toward therear and converge so that they cross each other under the pole, asindicated in Fig. 1. Their rear extremities are provided with elongatedslots 13, and through these slots a clamping bolt 14 passes, as shown.The details of this arrangement are illustrated in Fig. 3. The clampingbolt 1 1 has an enlarged head 15 which is adapted to clamp theoverlapping links upwardly against a washer or seat 16 on the under sideof the pole. The upper end of the bolt is provided with a thread 17which receives the threaded hub 18 of a crank or adjusting lever 19.This hub seats on a washer 20 on the upper face of the pole.

As indicated in Figs. 3 and '4, the links 11 are tapered, that is, theyare of gradually increasing thickness from their rear ends toward theirforward ends. From this arrangement when they are clamped by means ofthe clamping bolt, the rearward pull which the ground exerts on theteeth would naturally tend to thrust the links rearwardly on account ofthe fact that they enlarge toward their forward ends, it there forebecomes impossible for the links to shift on the bolt under the workingstrain. On this account it will be evident that the links and theclamping bolt afiord means for holding the cross bars in any adjustedpositions such as that indicated in the dotted lines in Fig. 1.

Very near the rear end of the pole, a fender or guard 21 is attached.This fender comprises two frame bars 23 which are attached respectivelyon the sides of the pole, as shown. The bodies of these bars aredepressed below the pole and extend rearwardly in a horizontal position,as indicated. From the frame bars 23, legs 24 extend downwardly, saidlegs consisting simply of iron straps, the lower ends of which areprovided with slots 25, respectively, as shown. These slots 25 receivebolts 26 which are attached to vertically disposed guard plates 27 whichare received against the inner side of the legs. These plates 27 are ofsubstantially rectangular form, presenting inclined forward edges 28.When the cultivator is in use, this tender straddles the row of plantsand protects them from the adjacent teeth of the harrow. It should beunderstood that the bolts 26 run loose in the slots so that the vplates27 may rise and fall as they pass over clods of dirt or unevennesses inthe ground. these plates 27 may be considered as floating plates orfloating shoes which protect the plants and at the same time ride overclods of dirt and stones which may lie in their path.

Having thus described my invention, I claim as new and desire to secureby Letters Patent,

1. A harrow having a plurality of teeth, members connecting said teethso as to adjust the same, links for holding said teeth rigidly in theiradjusted position, and means for clamping said links to hold said teethrigidly, said links being tapered and enlarging in the direction fromwhich the thrust is exerted at the clamping point.

In one aspect 2. A ha-rrow having a pole, laterally disposed .hoe barsattached thereto, teeth attached to said hoe bars, links attached tosaid hoe bars and crossing each other, and means for clamping said linkstogether at said pole, said links being of a thickness graduallyenlarging in the direction from which the pressure is exerted.

8. A cultivator having a pole, laterally extending hoe bars pivotallyattached there- .7

to, hoes attached to said hoe bars, links pivotally attached to said hoebars and having elongated slots therein, and a clamping bolt mounted insaid pole and passing through said slots, said links being of increasingthickness in the direction from which the thrust is exerted thereupon.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

GEORGE G. BRIGDEN.

Witnesses J. D. MoCRoRY, B. F. MCCRORY.

